An internationally-notorious criminal scientist returns to the US to sell his latest invention, a disintegrating gas, to a foreign power. When he arrives, however, he is spotted by a young Coast Guard man, whom he kills - and thus earns the enmity of the entire US Coast Guard, but especially the murdered Guardsman's older brother who, together with his reporter-girlfriend and her comical photographer, vigorously sets to tracking him down and interfering with his plans to develop the city-melting gas in quantity. A Republic Serial in 12 Chapters.
Bela Lugosi
as Boroff
Ralph Byrd
as Lt. Terry Kent
Maxine Doyle
as Jean Norman
Richard Alexander
as Thorg
Lee Ford
as Snapper McGee
Herbert Rawlinson
as Cmdr. Boyle
John Picorri
as G.A. Rackerby [Chs. 2-12]
Allen Connor
as Dick Norman
Thomas Carr
as Ens. Jim Kent [Ch. 1]
Lawrence Grant
as Rabinisi - Boroff's Spokesman at Screening [Ch. 1]
Carleton Young
as Henchman Dodds [Ch. 4]
George Chesebro
as L.H. Degado - Chief Thug [Ch. 5]
